Theory and Applications of GIS

A Proposal of GBD-Tree Initial Construction Method for Spatial Data Management

Yukio NEGISHI, Yutaka OHSAWA

2007 Volume 15 Issue 1 Pages 1-11
Published: June 30, 2007
Released on J-STAGE: December 14, 2009

DOIhttps://doi.org/10.5638/thagis.15.1

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This paper proposes fast initial construction methods of the GBD-tree. GDB tree has proper characteristics for management of large amount of 2 or 3 dimensional data. However, the GBD-tree needs long initial construction time, because no bulk insertion method as for R-tree has been proposed for the GBD-tree. This paper proposes fast initial construction method. The method requires only limited size of work space. The experimental results show the initial construction time reduces into a third or a quarter of the one-by-one insertion method. The memory efficiency and retrieval efficiency are also improved than the one-by-one insertion method.

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A Comparative Experimental Analysis on the Searching Time by Two Kinds of Address Indicatory Systems

Hidenori TAMAGAWA, Kyung Yeo PARK

2007 Volume 15 Issue 1 Pages 13-22
Published: June 30, 2007
Released on J-STAGE: May 29, 2009

DOIhttps://doi.org/10.5638/thagis.15.13

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This study aims to analyze the easiness of location search on a map with different kinds of address indicatory systems. We experimentally compare the time for the subjects to search the locations of given addresses in a part of Seoul City between by lot number based system and by road based system.
The result shows that the address by lot number based system is recognized more easily than that by road based system taking into account the average number of choices in the whole process of location search. It would be because of the complexity of road pattern in Korea as well as in Japan.

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Development of the GIS-based evacuation action analysis system against flood disasters

Osamu AKETA, Takafumi AMANO, Hirotake UCHIDA

2007 Volume 15 Issue 1 Pages 23-28
Published: June 30, 2007
Released on J-STAGE: May 29, 2009

DOIhttps://doi.org/10.5638/thagis.15.23

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In this study, the analysis system of evacuation action at the time of flood was developed using GIS. The system applied the network analysis which considers multiple refugees and shelters simultaneously and searches the shortest paths through the network links from halfway of the links. Moreover, the evacuation action was simulated in detail by linking network analysis and flood analysis. As a result, it was shown that the analysis system is applicable to plan suitable evacuation routes and shelters, and enlighten the residents on the importance of early evacuation.

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Outline of the water resources GIS application, Arc Hydro, and case studies in the United States

Akiyuki KAWASAKI, Satoshi YOSHIDA, Satoru SADOHARA

2007 Volume 15 Issue 1 Pages 29-37
Published: June 30, 2007
Released on J-STAGE: May 29, 2009

DOIhttps://doi.org/10.5638/thagis.15.29

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Arc Hydro data model and tools are described in this paper, which emphasizes the importance of integrating GIS applications for consistency and uniformity in order to further develop environmental researches. Arc Hydro is utilized by many organizations engaged in water resources and water basin management in the United States. Data model structures, tool functions for basin analysis, and relationships between hydrologic / hydraulic simulations and GIS applications are explained. Arc Hydro case examples from municipal governments and university's research / development are described.

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